release-notes: Update env path

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
diff --git a/openpower/scripts/release-notes b/openpower/scripts/release-notes
index 33974d5..1f598fb 100755
--- a/openpower/scripts/release-notes
+++ b/openpower/scripts/release-notes
@@ -1,4 +1,4 @@
-#!/bin/env perl
+#!/usr/bin/env perl
 
 use strict;